"I don't think we can challenge the points lead, even if we are winning [races] again," he added. "At the same time the others will still be scoring enough points so that their lead is not challenged."

The Austrian is however willing to admit when someone has done a better job.

"Before the season, we did not work as well as Mercedes," he said. "I must ungrudgingly recognise when someone else does a sensational job."

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